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3 years ago

Describe the relationship between atoms and elements,molecules, and compounds.

1 answer:

3 0

Elements are made up of identical atoms.
Molecules are made up from 2 or more atoms.
Compounds are made up from atoms of at least two elements.

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The physical quantity represented as rate of change of change in position in a

Oduvanchick [21]

Answer:

rate of change of its position with respect to a frame of reference, and is a function of time.

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3 years ago

What is the best description of a convergent boundary? (Do they move towards eachother, side by side past each other, away from

IrinaVladis [17]

Convergent boundaries move towards each other. They can be classified as continental-continental, or oceanic-continental.

Oceanic-Continental: Heavier oceanic plate slides under a continental plate in a process called subduction.

Continental-Continental: Tectonic plates push up against each other and often fold upwards, creating mountain ranges.

4 0

3 years ago

Springfield's "classic rock" radio station broadcasts at a frequency of 102.1 mhz. what is the length of the radio wave in meter

Mila [183]

The frequency of the radio wave is:
$f=102.1 MHz = 102.1 \cdot 10^6 Hz$

The wavelength of an electromagnetic wave is related to its frequency by the relationship
$\lambda= \frac{c}{f}$
where c is the speed of light and f the frequency. Plugging numbers into the equation, we find
$\lambda= \frac{3 \cdot 10^8 m/s}{102.1 \cdot 10^6 Hz}= 2.94 m$
and this is the wavelength of the radio waves in the problem.

7 0

3 years ago

A water pipe tapers down from an initial radius of R1 = 0.21 m to a final radius of R2 = 0.11 m. The water flows at a velocity v

Aleks [24]

Answer:

$0.116 m^3/s$

Explanation:

The volume flow rate of a fluid in a pipe is given by:

$Q=Av$

where

A is the cross-sectional area of the pipe

v is the speed of the fluid

In this problem, at the initial point we have

v = 0.84 m/s is the speed of the water

r = 0.21 m is the radius of the pipe, so the cross-sectional area is

$A=\pi r^2 = \pi (0.21 m)^2 =0.138 m^2$

So, the volume flow rate is

$Q=(0.138 m^2)(0.84 m/s)=0.116 m^3/s$

8 0

3 years ago

Pendulum clocks are made to run at the correct rate by adjusting the pendulum’s length. Suppose you move from one city to anothe

levacccp [35]

Answer:

Obviously Lengthen... $T = 2\pi \sqrt{L/g}$ or $g = 4\pi ^{2} L/g$

Explanation:

As we can observe from the equation, time period of a simple pendulum depends upon the length directly. When the gravitational acceleration increases the time period of the pendulum decreases and vice versa. So, by increasing the length, the time period can be adjusted...

4 0

2 years ago